I agree 100% on cleaning the threads just as you described, that's exactly how I do it. You'll never get an accurate torque reading with rusty/dirty/rough threads.
In fact tractor vet - you may remember the reason I have this particular head off was due to a blown gasket - on an engine that was recently rebuilt by the previous owner. (new to me farmall 560)
What I cleared out all of those bolt holes in the block answered the question for me of why this newly installed gasket probably blew. I don't think they've been cleaned in 60 years. Thick,dry, black gritty nastiness. I had to chase them and flush them several times.
Same with what I wire brushed off the bolt threads. Nasty.
had the head been on there for 20 years that'd be one thing, but as I said, this thing was just rebuilt. Somebody clearly rushed the job.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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